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Methyl jasmonate ameliorates lead toxicity in Oryza sativa by modulating chlorophyll metabolism, antioxidative capacity and metal translocation

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Abstract

Lead (Pb) not only negatively alters plant growth and yield but may also have potentially toxic risks to human health. Nevertheless, the interaction between rice (Oryza sativa L.) plants and the molecular cell dynamics induced by lead-methyl jasmonate (MJ) remains unknown. Here, plants were hydroponically exposed to Pb (150 and 300 µM) alone or in combination with 0.5 and 1 µM MJ. The application of MJ modulated the expression of the HMAs, PCS1, PCS2 and ABCC1 genes, thereby immobilizing the Pb in the roots and lessening its translocation to the aerial parts of the rice plant. The supplementation of MJ improved the growth and yield of Pb-stressed rice by adjusting the proline and chlorophyll metabolism, increasing the phytochelatins (PCs) accumulation and diminishing the accumulation of Pb in the shoots. the application of MJ alleviated the oxidative stress of rice plants exposed to Pb toxicity by enhancing the activity of antioxidant enzymes and enzymes of the glyoxalase system (glyoxalase I and II) and decreasing the endogenous levels of malondialdehyde (MDA), hydrogen peroxide (H2O2) and methylglyoxal (MG). Therefore, the results of the present study could provide a molecular insight and cellular interplay scheme for the development of a promising strategy in Pb-contaminated areas to produce healthy food.

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  1. Department of Agronomy, Islamic Azad University of Ayatollah Amoli Branch, Islamic Azad University, Amol, Iran

    Javad Salavati, Hormoz Fallah, Yosoof Niknejad & Davood Barari Tari

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  1. Javad Salavati
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Conceptualization and Methodology, JS and HF; Validation and Investigation, YN; Analysis, DBR; Resources, JS; Writing original, HF and YN; Review and editing. All authors have read and agreed to the published version of the manuscript.

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Correspondence to Hormoz Fallah.

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Salavati, J., Fallah, H., Niknejad, Y. et al. Methyl jasmonate ameliorates lead toxicity in Oryza sativa by modulating chlorophyll metabolism, antioxidative capacity and metal translocation. Physiol Mol Biol Plants 27, 1089–1104 (2021). https://doi.org/10.1007/s12298-021-00993-5

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